I test your WinMiner apllication around 2 weeks... I like active developement on your product and support... But it need some improvement in few things...
1.) REQUEST: Profitability switching isn't good enought. For example if I mine single coin(XMR) all day I earn around 20-70% more $ per day compared to automatic option... Coin swithcing is done to fast and this lead to losing money, because miner start mining and then switch to other coin... There must be done some application options like:
-General coin option(For all coins) to set periodic benchmarking. For example checkbox for automatic(your logic) or custom(user can configure timeout in minutes/hours). For me 1x per day is enought.
-General coin option(For all coins) to set periodic profitability check(Check which coin profit is best). For example checkbox for automatic(your logic) or custom(user can configure timeout in minutes/hours). For me 1x per 2/4 hours is enought.
-General coin option(For all coins) to set profitability current/average of coin. For example checkbox for current(check which coin is curently best profitable by price, difficulty...) or average. On average must be two options automatic(your logic) or custom(user can configure hours/days which are used to calculate average of coin profitability).
-General coin option(For all coins) to set minimum difference in coin price beetwen old mining coin and new minning coin to switchower. For example checkbox for automatic(your logic) or custom(user can configure earning price difference in currency which have selected in settings  example 1.50 USD).

2.) BUG: I see that service WinMiner_Service stop sometime(version 1.74x maybe this is fixed in 1.75 it is to soon to tell)... Maybe add some watchdog to check if service is running and start/restart it if not running but must running...

3.) REQUEST: Option to disable automatic update

4.) REQUEST: Settings for EACH coin miner intensity settings. For example checkbox for automatic(your logic) or custom(user set for XMR Intensity=18 all other are auto)

5.) BUG: WinMiner update, kill WinMiner but leave icon in tray. You need to clean them else there are a lot of WinMiner icons...

6.) BUG: Live statistic usualy need refresh on first open to show data of miners.

7.) Add some other coins like FTC, SIB ...

8.) BUG: When I have enabled mining oly XMR coin sometime I receive message that there is no job from server...

9.) BUG: Live statistic - Removing Miner do not work. It show "Please wait" and then is remove button back. Logout/Login do not help.

10.) BUG Whe exit application(Tray icon is also removed) Service still running.